using System;

​

public class Program

{

    public static void Main()

    {

        Random rnd = new Random();

        int x = rnd.Next(1, 51);

        int y = rnd.Next(1, 51);

        Console.WriteLine("what is " + x + "  +  " + y);

        int userAns = Convert.ToInt32(Console.ReadLine());

        if (userAns == x + y)

            Console.WriteLine("correct");

        else

            Console.WriteLine("incorrect");

    }

}